Abstract
The circadian rhythm of CO 2 output in leaves of Bryophyllum fedtsschenkoi damps out after 3-4 d in continuous darkness and CO 2 -free air stream at 15 o C. The rhythm is reinitiated after a single exposure to white light of 2, 4, 6 or 8 h duration, damps out again after a further 3-4 d and can be reinitiated for a second time by a further exposure to light. During the exposure to light there is a burst of CO 2 output consistent with the decarboxylation of malate, and the rhythm begins afterwards with an initial high rate of CO 2 fixation. Malate gradually accumulates in the leaves in continuous darkness to attain a maximum value (35 mol m -3 ) at the time when the circadian rhythm disappears, and decreases to a low value (19 mol m -3 ) after a 4 h exposure to light which reinitiates rhythmicity
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